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My question is this because the keyword has high click-thru rate or because there are no other competitors bidding on the keyword, or both? What is the minimum click rate to see this top bar result?
we have discussed this a number of times, and the conclusion includibg a comment by GoogleGuy was:
its a combination of CTR, Keyword popularity and the fact no one has bought the premium spots.
this thread may help:
What is happening? Why doesnt Google implement a point by point policy on what will happen instead of us guessing when our stuff will and will not be in Google.